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Proceedings Paper

Design of a new sensor of multiple gases based on the integration of interference filters
Author(s): Fernando Lopez; Antonio J. de Castro; Juan Melendez; Jesus Meneses
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Paper Abstract

The integration of different infrared interference filters on a single substrate to obtain filter arrays is discussed. These arrays, when coupled in the focal plane to linear photodetector arrays, form the so-called `spectral retinae' which permit spectral and spatial resolution with no moving parts. Its application to new multigas sensors based on infrared absorption spectroscopy is also discussed. The different aspects emerging in the integration of specific interference filters are discussed in this paper. Special attention is paid to the problems of compatibility of the different processes involved in the obtention of the integrated filter. The improvement of detection limits for gases of great environmental interest as sulfur dioxide, and nitrogen dioxide is also discussed. Aspects related to the whole conception of the sensor are studied too, mainly those related to the improvement of signal to noise ratio by means of the optimization of the optical parameters. Finally, a new concept for using spectrally selective mirrors in long path optical cells, is proposed. In this way a considerable improvement in simplicity and performance of the spectral retinae can be obtained.

Paper Details

Date Published: 4 November 1994
PDF: 9 pages
Proc. SPIE 2253, Optical Interference Coatings, (4 November 1994); doi: 10.1117/12.192172
Show Author Affiliations
Fernando Lopez, Univ. Carlos III (Spain)
Antonio J. de Castro, Univ. Carlos III (Spain)
Juan Melendez, Univ. Carlos III (Spain)
Jesus Meneses, Univ. Carlos III (Spain)

Published in SPIE Proceedings Vol. 2253:
Optical Interference Coatings
Florin Abeles, Editor(s)

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